1. \(54 \div 6 - 48 \div 6 = 9 - 8 = 1\)
2. \(96 \div 4 - 2 \div 6 = 24 - \frac{1}{3} = 23\frac{2}{3}\)
3. \(45 \div 6 - 6 \div 5 = \frac{45}{6} - \frac{6}{5} = \frac{225}{30} - \frac{36}{30} = \frac{189}{30} = 6\frac{9}{30} = 6\frac{3}{10}\)
4. \(12 \div 6 + 18 \div 6 = 2 + 3 = 5\).